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Influence of Both Cooling Rate and TeO2 Addition on the Properties of YBCO Superconductor

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Metallurgical and Materials Transactions E

Abstract

Composite of superconducting system YBCO-TeO2 was synthesized utilizing solid-state reaction technique. Different weight percentages of TeO2 were mixed with a basic mixture [YBCO] for the synthesis of [YBa2Cu3O7−y ]1−x (TeO2) x composites. These mixtures were sintered at 1213 K (940 °C) for 24 hours and the samples cooled down by two different ways. The first way carried out via slowly cooling in furnace with the rate of 274 K/min to 275 K/min (1 °C/min to 2 °C/min) and the second one is quenching in oxygen gas. The XRD analysis showed that YBCO orthorhombic phase is the major phase appeared in all samples with different TeO2 content regardless of the cooling way. Additionally, minor unknown secondary phases appeared and enlarged with increasing TeO2 addition. Although quenched samples showed a phase difference between the sample's outer surface (orthorhombic) and its interior (tetragonal), the slowly cooled one did not clearly show such distinction. Moreover, doping YBCO with TeO2 leads to increase in the sample bulk density and reduction in their degradation degree in the wet atmosphere.

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Authors and Affiliations

  1. Advanced Materials Department, Central Metallurgical Research and Development Institute, CMRDI, P.O. Box: 87, Helwan, El-Felzat St, El-Tebin, Cairo, Egypt

    Yasser Momtaz Zaki Ahmed (Professor)

  2. Mineral Characterization Division, Mineral Technology Department, Central Metallurgical Research and Development Institute, CMRDI, P.O. Box: 87, Helwan, El-Felzat St, El-Tebin, Cairo, Egypt

    Mervat Said Hassan (Professor)

  3. Higher Institute of Optics Technology, 60 Obour St., Misr El-Gedida, Cairo, Egypt

    Hassan Abd-Elatif (Researcher)

Authors
  1. Yasser Momtaz Zaki Ahmed
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  2. Mervat Said Hassan
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  3. Hassan Abd-Elatif
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Correspondence to Yasser Momtaz Zaki Ahmed.

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Manuscript submitted March 29, 2016.

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Ahmed, Y.M.Z., Hassan, M.S. & Abd-Elatif, H. Influence of Both Cooling Rate and TeO2 Addition on the Properties of YBCO Superconductor. Metallurgical and Materials Transactions E 3, 317–328 (2016). https://doi.org/10.1007/s40553-016-0097-6

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  • DOI: https://doi.org/10.1007/s40553-016-0097-6

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